package com.example.springboot_mvc_demo.log;

import java.lang.reflect.Method;
import java.net.InetAddress;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.example.springboot_mvc_demo.utils.ServletUtils;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.AfterThrowing;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.http.HttpMethod;
import org.springframework.stereotype.Component;
import org.springframework.web.multipart.MultipartFile;


/**
 * 操作日志记录处理
 *
 */
@Aspect
@Component
public class LogAspect {
    private static final Logger log = LoggerFactory.getLogger(LogAspect.class);

    public static final ThreadLocal<Map> saveMsg = ThreadLocal.withInitial(() -> new HashMap());

    // 配置织入点
    @Pointcut("@annotation(com.example.springboot_mvc_demo.log.Log)")
    public void logPointCut() {
    }

    /**
     * 处理完请求后执行
     * returning: 表示被切入的方法的返回值将被绑定到这个名称上
     *
     * @param joinPoint 切点
     */
    @AfterReturning(pointcut = "logPointCut()", returning = "jsonResult")
    public void doAfterReturning(JoinPoint joinPoint, Object jsonResult) {
        handleLog(joinPoint, null, jsonResult);
    }

    /**
     * 拦截异常操作
     *
     * @param joinPoint 切点
     * @param e         异常
     */
    @AfterThrowing(value = "logPointCut()", throwing = "e")
    public void doAfterThrowing(JoinPoint joinPoint, Exception e) {
        handleLog(joinPoint, e, null);
    }


    protected void handleLog(final JoinPoint joinPoint, final Exception e, Object jsonResult) {
        try {
            // 获得注解
            Log controllerLog = getAnnotationLog(joinPoint);
            if (controllerLog == null) {
                return;
            }
            Map map = saveMsg.get();
            if (e != null) {
                log.error("发生了错误，：{}", e.getMessage());
                map.put("errorMsg",e.getMessage());
            }
            String requestMethod = ServletUtils.getRequest().getMethod();
            // 设置方法名称
            String className = joinPoint.getTarget().getClass().getName();
            String methodName = joinPoint.getSignature().getName();

            map.put("className", className);
            map.put("methodName", methodName);
            map.put("requestMethod", requestMethod);
            // 处理设置注解上的参数
            getControllerMethodDescription(joinPoint, controllerLog, map);
            if (e != null) {
                log.error("write to DB:log:{}", map);
            }else {
                log.error("write to DB:log:{}", map);
            }

        } catch (Exception exp) {
            // 记录本地异常日志
            log.error("==前置通知异常==");
            log.error("异常信息:{}", exp.getMessage());
            exp.printStackTrace();
        }
    }

    /**
     * 获取注解中对方法的描述信息 用于Controller层注解
     *
     * @param log     日志
     * @param operLog 操作日志
     * @throws Exception
     */
    public void getControllerMethodDescription(JoinPoint joinPoint, Log log, Map operLog) throws Exception {
        // 设置action动作
        operLog.put("businessType", log.businessType().ordinal());
        // 设置标题
        operLog.put("title", log.title());
        // 是否需要保存request，参数和值
        if (log.isSaveRequestData()) {
            // 获取参数的信息，传入到数据库中。
            setRequestValue(joinPoint, operLog);
        }
    }

    /**
     * 获取请求的参数，放到log中
     *
     * @param operLog 操作日志
     * @throws Exception 异常
     */
    private void setRequestValue(JoinPoint joinPoint, Map operLog) throws Exception {
        String requestMethod = (String) operLog.get("requestMethod");
        if (HttpMethod.GET.name().equals(requestMethod) || HttpMethod.POST.name().equals(requestMethod)) {
            //需要转成json,但是需要额外引入 json jar包,就转成str
            List<String> collect = Arrays.stream(joinPoint.getArgs()).map(item -> item.toString()).collect(Collectors.toList());
            operLog.put("operParam", collect);
        }
    }

    /**
     * 是否存在注解，如果存在就获取
     */
    private Log getAnnotationLog(JoinPoint joinPoint) throws Exception {
        Signature signature = joinPoint.getSignature();
        MethodSignature methodSignature = (MethodSignature) signature;
        Method method = methodSignature.getMethod();

        if (method != null) {
            return method.getAnnotation(Log.class);
        }
        return null;
    }


    /**
     * 判断是否需要过滤的对象。
     *
     * @param o 对象信息。
     * @return 如果是需要过滤的对象，则返回true；否则返回false。
     */
    public boolean isFilterObject(final Object o) {
        return o instanceof MultipartFile || o instanceof HttpServletRequest || o instanceof HttpServletResponse;
    }


    public String getLocalIp() throws Exception {
        InetAddress addr = InetAddress.getLocalHost();
        return addr.getHostAddress();
    }

}
